<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../Class6/jquery.min.js"></script>
</head>
<body>
    <script>
        $(function() {
            $('button').click(function() {
                $(this).css('background','pink');
                $(this).siblings().css('background','');
            })
        })
    </script>

    <button>按钮1</button>
    <button>按钮2</button>
    <button>按钮3</button>
</body>
</html>